ES2154791T3 - FOLDED ACTIVE FILTER. - Google Patents

FOLDED ACTIVE FILTER.

Info

Publication number
ES2154791T3
ES2154791T3 ES96307696T ES96307696T ES2154791T3 ES 2154791 T3 ES2154791 T3 ES 2154791T3 ES 96307696 T ES96307696 T ES 96307696T ES 96307696 T ES96307696 T ES 96307696T ES 2154791 T3 ES2154791 T3 ES 2154791T3
Authority
ES
Spain
Prior art keywords
transistors
active filter
collector
base electrodes
stages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
ES96307696T
Other languages
Spanish (es)
Inventor
Nicholas Mihailovits
Trevor Peter Beatson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Microsemi Semiconductor Ltd
Original Assignee
Mitel Semiconductor Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9522365.7A external-priority patent/GB9522365D0/en
Priority claimed from GBGB9522366.5A external-priority patent/GB9522366D0/en
Application filed by Mitel Semiconductor Ltd filed Critical Mitel Semiconductor Ltd
Application granted granted Critical
Publication of ES2154791T3 publication Critical patent/ES2154791T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1213—Frequency selective two-port networks using amplifiers with feedback using transistor amplifiers

Landscapes

  • Networks Using Active Elements (AREA)
  • Materials For Photolithography (AREA)
  • External Artificial Organs (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Filtering Materials (AREA)

Abstract

Active filter circuit 1 consists of five filter stages 70-74 cascoded between a voltage supply and ground potential. The circuit has two major current paths, the first through the collector-emitter paths at transistors 31, 33, 35, 37 and 39, the second through transistors 32, 34, 36, 38 and 40. Each major current path is driven by a current source 61, 62. In operation, a differential input signal is applied to the base electrodes of transistors 31, 32 and a differential output signal is taken from the emitters of transistors 39, 40. The transistors 33, 34 of stage 71 have their collector and base electrodes cross-coupled. Transistors 3540 of stages 72-74 are connected in the same manner. In another embodiment (Figure 3, not shown) a cut-off frequency is varied under control of controllable current sources.
ES96307696T 1995-11-01 1996-10-24 FOLDED ACTIVE FILTER. Expired - Lifetime ES2154791T3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9522365.7A GB9522365D0 (en) 1995-11-01 1995-11-01 Folded active filter stack
GBGB9522366.5A GB9522366D0 (en) 1995-11-01 1995-11-01 Active filter stack

Publications (1)

Publication Number Publication Date
ES2154791T3 true ES2154791T3 (en) 2001-04-16

Family

ID=26308028

Family Applications (1)

Application Number Title Priority Date Filing Date
ES96307696T Expired - Lifetime ES2154791T3 (en) 1995-11-01 1996-10-24 FOLDED ACTIVE FILTER.

Country Status (6)

Country Link
US (2) US5912587A (en)
EP (2) EP0772295B1 (en)
JP (2) JPH09199988A (en)
AT (2) ATE199615T1 (en)
DE (2) DE69613536T2 (en)
ES (1) ES2154791T3 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100317176B1 (en) * 1997-11-28 2002-01-16 니시무로 타이죠 Filtering circuit
US6552580B2 (en) * 1999-05-24 2003-04-22 Level One Communications Inc. Bias technique for operating point control in multistage circuits
GB0027069D0 (en) 2000-11-06 2000-12-20 Lsi Logic Europ Ltd Transconductance continuous time filter circuit
JP3644387B2 (en) * 2001-01-10 2005-04-27 ソニー株式会社 Filter circuit
US7161442B2 (en) * 2003-01-06 2007-01-09 United Microelectronics Corp. Latch system comprising an action module to increase negative resistance
US6885245B2 (en) * 2003-04-08 2005-04-26 Via Technologies, Inc. Differential amplifier and comparator using the same
KR100618354B1 (en) * 2005-02-04 2006-08-31 삼성전자주식회사 Ultra wide band filter for using cross-coupled transistor pair
US7408409B2 (en) * 2006-06-27 2008-08-05 Intel Corporation Amplifier circuit with cross-coupled cascode transistors
US7733165B2 (en) * 2007-02-27 2010-06-08 Infineon Technologies Ag Circuit arrangement with interference protection
DE102010026629A1 (en) * 2010-07-09 2012-01-12 Rohde & Schwarz Gmbh & Co. Kg Linear differential amplifier with high input impedance
US9184957B2 (en) * 2012-12-27 2015-11-10 Intel Corporation High speed receivers circuits and methods

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6501840A (en) * 1965-02-13 1966-08-15
NL6908784A (en) * 1969-06-10 1970-12-14
JPS59181807A (en) * 1983-03-31 1984-10-16 Toshiba Corp Transistor amplifier
US4514704A (en) * 1983-08-26 1985-04-30 Curtis Douglas R Variable filter circuit
SE457922B (en) * 1987-06-18 1989-02-06 Ericsson Telefon Ab L M DEVICE FOR ACTIVE FILTER AND USE THEREOF
US5081423A (en) * 1988-07-28 1992-01-14 Kabushiki Kaisha Toshiba Integrator and active filter including integrator with simple phase compensation
US5225790A (en) * 1992-02-28 1993-07-06 Digital Equipment Corporation Tunable wideband active filter
US5489878A (en) * 1994-11-23 1996-02-06 Analog Devices Current-controlled quadrature oscillator based on differential gm /C cells

Also Published As

Publication number Publication date
US5847605A (en) 1998-12-08
EP0772295B1 (en) 2001-06-27
DE69611967T2 (en) 2001-06-21
EP0772294A1 (en) 1997-05-07
ATE199615T1 (en) 2001-03-15
EP0772295A1 (en) 1997-05-07
DE69613536D1 (en) 2001-08-02
DE69613536T2 (en) 2002-04-11
EP0772294B1 (en) 2001-03-07
ATE202663T1 (en) 2001-07-15
DE69611967D1 (en) 2001-04-12
JPH09199988A (en) 1997-07-31
JPH09214286A (en) 1997-08-15
US5912587A (en) 1999-06-15

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